My brake light bulb warning on the dash of my Mk2 GTE 16v came on last night which is fine, but when I turned off the headlights and put my foot on the brake pedal the headlights flashed in time with the brake pedal being depressed. Anyone got any ideas, I suspect its a dodgy earth but can't think where that might be for the rear lights. I checked that the brake and side lights were OK and they are. It didn't do it to begin with this morning then started again right towards the end of my journey.
Oh I hate electrics
Cheers for any help